Note: Latin-speaking philosopher, theologian, one of the Latin Fathers of the Church, one of the Doctors of the Church, and perhaps the most significant Christian thinker after St. Paul. Augustine's adaptation of classical thought to Christian teaching created a theological system of lasting influence. His numerous written works, the most important of which are Confessions and City of God, shaped the practice of biblical exegesis and helped lay the foundation for much of medieval and modern Christian thought.